7.4V Lithium Battery Charger Circuit

1 year ago 3259
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In this project we will build a Two Stage Lithium Battery charger (CC and CV) that could be used as to charge Lithium ion or lithium polymer batters. The battery charger circuit is designed for 7.4V lithium battery pack (two 18650 in Series) but the circuit can be easily modified to fit in lower or slightly higher battery Packs like to build 3.7 lithium battery charger or 12v lithium ion battery Charger.

It is using LM317 and Arduino, charge current 800mA (CC) and charge voltage 8.4 (CV).



7.4V Arduino PCB


ID Name Designator Footprint Quantity Mounted
1 32462a6c3bedf25b27ec723a8c000867 CONSTANT_CURRENT,CONSTANT_VOLTAGE TO-220(TO-220-3) 2 Yes C89320
2 2191314250ed43a796b57d45825575c3 R1 10W 1 Yes
3 2191314250ed43a796b57d45825575c3 R3 AXIAL-0.3 1 Yes
4 2191314250ed43a796b57d45825575c3 R2 AXIAL 0.3/0.8/1.5 1 Yes
5 spdt 12v relay U5,U1 5 PIN SPDT RELAY 2 Yes
6 DC JACK IN_+12V DC JACK (123) 1 Yes
7 1N4007 D2,D1 DO-41 2 Yes
8 4fbd1151c7aa0bd1c185297de9137d59 Q1,Q2 TO-92(TO-92-3) 2 Yes C2092
9 2191314250ed43a796b57d45825575c3 R5,R4,R8 AXIAL-0.3 3 Yes
10 0b6ea66f1a77ef3069b26dadb3d73791 P1 HDR-1X2/2.54 1 Yes C49661
11 2191314250ed43a796b57d45825575c3 R6,R7 AXIAL-0.3 2 Yes
12 2191314250ed43a796b57d45825575c3 SHUNT 1W 1 Yes
14 73cf4db60ff344f8a415b734dfaec7a1 C1 CAP-D3.0XF1.5 1 Yes
15 936ea00a73b34520be16bf6c142d832c U4 LCD 1 Yes
16 16759c094eae457e80b48c4f32f3cfea R9 TRIMPOT 1 Yes C125022


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